Ann Arbor, Michigan is planning to install LEDs in its streetlights to save money on lighting costs. Apparently this investment is going to pay for itself in four years. There seems to be a bit of a mini-green revolution right now, as just about every finance blog or personal improvement blog talks about replacing your own light bulbs with CFLs or LEDs. We got a pack of them from Wal-Mart to replace some 60-watt bulbs, and we’re pretty sure that the “60-watt equivalent” is brighter than the regular incandescent bulb after it warms up. Wal-Mart even has their own brand of CFLs, and that’s what we’re using now. It’s a bit of an investment, but we’re planning on replacing a few more bulbs each month to try to cut down on our utilities bill.